EP2259467B1 - Dispositif de terminal et dispositif de station de base - Google Patents

Dispositif de terminal et dispositif de station de base Download PDF

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Publication number
EP2259467B1
EP2259467B1 EP10164880A EP10164880A EP2259467B1 EP 2259467 B1 EP2259467 B1 EP 2259467B1 EP 10164880 A EP10164880 A EP 10164880A EP 10164880 A EP10164880 A EP 10164880A EP 2259467 B1 EP2259467 B1 EP 2259467B1
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EP
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Prior art keywords
base station
format
uplink
response
channel
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EP10164880A
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German (de)
English (en)
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EP2259467A2 (fr
EP2259467A3 (fr
Inventor
Dai Kimura
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Fujitsu Ltd
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Fujitsu Ltd
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Publication of EP2259467A3 publication Critical patent/EP2259467A3/fr
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff

Definitions

  • the embodiments discussed herein are directed to a terminal device and a base station device which perform wireless communication.
  • HSDPA High Speed Downlink Packet Access
  • a packet transmission speed in a downlink (from base station to terminal) direction of about 384 kbps to 2 Mbps up to 14.4 Mbps at maximum is used for communication of a mobile station such as a mobile terminal.
  • the HSDPA automatically selects suitable modulation scheme and coding scheme according to a radio wave condition. For example, if the radio wave condition is bad, QPSK (Quadrature Phase Shift Keying) with high stability but low bit-rate is used, while if the radio wave condition is good, modulation is performed by using higher-bit-rate 16QAM (16 Quadrature Amplitude Modulation).
  • QPSK Quadrature Phase Shift Keying
  • the HSDPA changes an error correction method in such a manner that when the radio wave condition is bad, a low-code-rate coding scheme with a high error correction capability is used, and that when the radio wave condition is good, then a high-code-rate coding scheme with a low error correction capability is used.
  • the HSDPA adopts an HARQ (Hybrid Automatic Repeat Request) scheme to suppress the number of retransmissions upon detection of an error.
  • HARQ Hybrid Automatic Repeat Request
  • a base station transmits a control channel (PDCCH) including downlink scheduling information (DL Scheduling Information) and a downlink data channel (PDSCH) including downlink transmission data.
  • PDCH control channel
  • DL Scheduling Information downlink scheduling information
  • PDSCH downlink data channel
  • a terminal receives the downlink data channel according to the scheduling information, and notifies the base station of ACK (success of reception) being a transmission acknowledgement signal ACK (acknowledgement) or NACK (failure of reception) using an uplink channel based on a result of Cyclic Redundancy Check (CRC).
  • the base station when receiving the ACK, stops HARQ, and retransmits data (transmits error correction bits different from the initially transmitted data) when receiving the NACK. Then, the terminal combines the initially received data with the retransmitted error correction bits, so that an error correction capability can be improved. If there is no error, then the data is transmitted at one time, while if there is an error, then the error can be corrected with a less number of data retransmissions. Therefore, the terminal can increase an average throughput.
  • the terminal cannot recognize transmission of PDSCH and cannot perform a reception process of PDSCH, and therefore, transmission of ACK/NACK is not performed. More specifically, when receiving ACK/NACK from the terminal, the base station needs to perform three-value determination including DTX being a state in which the terminal fails to receive PDCCH including "DL Scheduling Information" and does not transmit ACK/NACK, in addition to two-value determination of ACK/NACK.
  • the base station transmits uplink-channel transmission information (UL Grant) to the terminal using PDCCH, and the terminal transmits uplink data channel (PUSCH) including uplink transmission data to the base station based on the information.
  • UL Grant uplink-channel transmission information
  • PUSCH uplink data channel
  • the terminal needs to simultaneously transmit ACK/NACK and PUSCH to the base station.
  • the uplink data signal PUSCH in LTE uplink is transmitted on a single carrier in order to realize a low PAPR (Peak to Average Power Ratio). Therefore, the simultaneous transmission of ACK/NACK and PUSCH in a multiplexing manner on a frequency axis causes an increase in PAPR.
  • the terminal needs to temporally multiplex ACK/NACK and uplink data on a data signal inside the PUSCH and transmit the data.
  • ACK/NACK is overwritten in the data signal of PUSCH and is transmitted. More specifically, as represented in FIG. 12 , the terminal creates uplink data according to the uplink-channel transmission information (UL Grant), and when there is ACK/NACK information to be transmitted, part of the data is overwritten with ACK/NACK symbol and transmitted. At this time, if the number of symbols for ACK/NACK is increased, then a code rate of ACK/NACK bits becomes smaller, so that receiving characteristic is improved. Therefore, in LTE, the number of symbols used for ACK/NACK transmission is changed according to MCS (Modulation and Coding Scheme) specified by "UL Grant".
  • MCS Modulation and Coding Scheme
  • a technology for always ensuring symbols for ACK/NACK transmission More specifically, as represented in FIG. 13 , a time domain for transmitting data is always limited regardless of whether ACK/NACK is transmitted. In this case also, the number of symbols is usually changed by MCS.
  • the conventional technology has a problem that there is a trade-off between data transmission efficiency and ACK/NACK determination accuracy, and that high ACK/NACK determination accuracy cannot be ensured without a decrease in efficiency.
  • a transmission side e.g., terminal
  • ACK/NACK when ACK/NACK is not transmitted because of failure of reception of PDCCH, enters data for PUSCH into a portion of which ACK/NACK is supposed to be transmitted, and transmits the data. Therefore, in a reception side (e.g., base station), because values of bits in ordinary data are usually randomly different from bits of ACK/NACK after being coded, it is possible to perform three-value determination of ACK/NACK/DTX using the randomness.
  • the number of symbols for which ACK/NACK are multiplexed is large enough, then satisfactory determination accuracy of the three-value determination can be obtained. Meanwhile, if the number of symbols is small, then there arises a problem that the determination accuracy is largely degraded even if an SNR (Signal to Noise Ratio) is large.
  • the transmission side e.g., terminal
  • the transmission side always ensures symbols for ACK/NACK transmission, and thus can ensure satisfactory determination accuracy if the SNR is large even if the number of symbols is small. Meanwhile, if there are a large number of symbols in particular, then there arises a problem that the number of symbols for PUSCH is always largely reduced and this causes low use efficiency of uplink resources.
  • a terminal device and a base station device capable of ensuring high ACK/NACK determination accuracy without a decrease in transmission efficiency of data signals.
  • WO 2008/120544 A1 discloses a radio communication system that includes a base station device which performs communication with a mobile station. According to a radio resource allocation, the mobile station transmits a first signal to the base station device.
  • the base station device includes; decoding means for decoding the first signal; and means for transmitting a control signal for retransmission of the first signal to the mobile station when the first signal has not been received normally.
  • WO 2008/114662 A1 discloses a base station device that communicates with a user device in a mobile communication system.
  • the base station device comprises a means for preparing delivery confirmation information indicating whether an uplink signal received from a user device should be retransmitted or not, a means for preparing control information that permits the user device to send an up-link signal, and a means for notifying the user device of the delivery confirmation information and the control information.
  • WO 2008/105420 A1 discloses a base station device which performs communication with a mobile station by using an uplink shared channel. It provides a step of allocating an uplink shared channel to the mobile station and instructing a transmission by using the allocated shared channel; a step of measuring the radio quality of the shared channel which has been allocated to the mobile station; and a step of judging whether the mobile station has transmitted data by using the shared channel according to the radio quality.
  • WO 2008/105316 A1 discloses a base station device which performs communication with a plurality of user devices by using a shared channel.
  • the resource decision means transmits the control channel to some of the user devices among the selected user devices.
  • JP 2008 193648 A discloses a base station in which common control information includes a format indicator indicating which of predetermined selection values is the number of symbols occupied by the control channel in one sub-frame.
  • the common control information includes a specified multiplexing number or a smaller number of unit information parts of predetermined data sizes. The specified multiplexing number is contained in report information.
  • EP 1 513272 A1 discloses a transmission destination determiner that selects individual communication terminal apparatus as candidates to transmit packets to and determines a transmission destination apparatus based on CQI signals from these communication terminal apparatuses.
  • a terminal device comprising: a format deciding unit that decides a transmission format of an uplink data channel to be transmitted to a base station device based on uplink-channel transmission information for specifying a transmission format of an uplink data channel to be transmitted to the base station received from the base station device; a response deciding unit that decides a response content to the base station device when a downlink data channel is received from the base station device, based on a result of decoding the downlink data channel; and a response transmitting unit that transmits the response content decided by the response deciding unit to the base station device through the uplink data channel using the transmission format decided by the format deciding unit, wherein the format deciding unit switches between a first format for overwriting the response content in data and a second format ensuring an area for the response content indicating whether or not the response is transmitted to the base station device, based on the uplink-channel transmission information.
  • a base station device comprising:
  • a method of controlling a terminal device comprising: first deciding a transmission format of an uplink data channel to be transmitted to a base station device based on uplink-channel transmission information for specifying a transmission format of an uplink data channel to be transmitted to the base station received from the base station device; second deciding a response content to the base station device when a downlink data channel is received from the base station device, based on a result of decoding the downlink data channel; and transmitting the decided response content to the base station device through the uplink data channel using the decided transmission format, wherein the first deciding includes switching between a first format for overwriting the response content in data and a second format for ensuring an area for the response content indicating whether or not the response is transmitted to the base station device, based on the uplink-channel transmission information.
  • FIG. 1 is a schematic for explaining the overall configuration of a communication system according to a first embodiment.
  • the communication system includes a base station being a server device that directly communicates with a terminal device (mobile station) through wireless communication, and a mobile station being a terminal device that is connected to the base station through the wireless communication and can use various communication services such as voice communication and data communication.
  • one base station and one mobile station are illustrated here, however, the number of connected devices is not limited thereto.
  • the mobile station is used as the terminal device will be explained herein, however, it is possible to use various terminal devices such as a personal computer, a home-use game machine, an Internet TV, a PDA, or a mobile communication terminal such as a mobile phone and a PHS.
  • the base station and the mobile station perform communication using LTE which is higher speed than HSDPA, and this allows high-speed data communication.
  • HARQ is implemented in such a manner that data of which normal transmission/reception is failed between the base station and the mobile station is used for its retransmission without disposing the data to suppress data retransmission when an error occurs.
  • a throughput of a user (mobile station) of which reception condition is bad is improved, so that an average throughput is increased.
  • communication is performed using LTE, data retransmission using HARQ is implemented, and high ACK/NACK determination accuracy can be ensured without a decrease in the efficiency.
  • the mobile station in the communication system decides a format of an uplink data channel to be transmitted to the base station based on the uplink-channel transmission information received from the base station.
  • the mobile station when receiving a downlink data channel from the base station, decides a response content to the base station based on the result of decoding the downlink data channel, and transmits the decided response content to the base station through the uplink data channel using the decided format.
  • the base station in the communication system receives an uplink signal to measure an SIR (Signal to Interference power Ratio) of the uplink, from the mobile station, and measures an uplink SIR from the received signal.
  • the base station decides MCS (Modulation and Coding Scheme) based on the measured uplink SIR.
  • MCS Modulation and Coding Scheme
  • the base station transmits the decided MCS included in the uplink-channel transmission information (UL Grant) to the mobile station using the control channel (PDCCH).
  • UL Grant uplink-channel transmission information
  • the mobile station When the MCS added to the uplink-channel transmission information (UL Grant) received from the base station is a small value less than a threshold, a required SNR is small, and thus, the mobile station increases the number of symbols for ACK/NACK, so that it is desirable to increase ACK/NACK determination accuracy. Therefore, the mobile station, when the MCS is small, decides to use a format #1 for overwriting the symbol for transmission of ACK/NACK in Data as represented in (a) of FIG. 1 . Meanwhile, in the mobile station, when the MCS included in the uplink-channel transmission information (UL Grant) received from the base station is a large value equal to or more than the threshold, because the SNR is large and the determination accuracy is high, the number of symbols for ACK/NACK may be small. Therefore, when the MCS is large, the mobile station decides to use a format #2 for always ensuring the symbol for transmission of ACK/NACK as represented in (b) of FIG. 1 .
  • the mobile station receives the control channel (PDCCH) including the downlink scheduling information (DL Scheduling Information) from the base station, and receives the downlink data channel (PDSCH) according to the "DL Scheduling Information".
  • the mobile station decodes the received downlink data channel (PDSCH) and performs Cyclic Redundancy Check (CRC) operation.
  • CRC Cyclic Redundancy Check
  • the mobile station decides a response content in such a manner that, when it is determined by the decoding and the CRC result that PDSCH can be successfully received, then the response content is "ACK (success of reception)" and, when it is determined that PDSCH cannot be successfully received, then the response content is "NACK (failure of reception)". If "DL Scheduling Information" cannot be received, then the mobile station decides to respond DTX indicating a state in which ACK/NACK is not transmitted, as the response content.
  • the mobile station When it is determined that the format #1 is used, the mobile station overwrites ACK or NACK (in the case of DTX, there is no data as a target for transmission) in a part of Data portion of a data format, and transmits the uplink data channel (PUSCH) including uplink transmission data to the base station. Moreover, when it is decided that the format #2 is used, the mobile station writes ACK or NACK (in the case of DTX, there is no data as a target for transmission) to a predetermined area of the previously ensured data format, and transmits the uplink data channel (PUSCH) to the base station.
  • ACK or NACK in the case of DTX, there is no data as a target for transmission
  • the base station when receiving the uplink data channel (PUSCH) from the mobile station, implements the three-value determination of ACK/NACK/DTX using a method based on the MCS transmitted to the mobile station, and can obtain the result of transmission from the mobile station. More specifically, the base station performs the three-value determination using the symbol pattern for ACK/NACK, because the format #1 with a large number of symbols for ACK/NACK is used when the MCS value less than the threshold (MCS is small) is transmitted to the mobile station.
  • MCS threshold
  • the base station performs the three-value determination using received power in an ACK/NACK area, because the format #2 with a small number of symbols for ACK/NACK is used when the MCS value equal to or more than the threshold (MCS is large) is transmitted to the mobile station.
  • the base station performs a process of stopping HARQ or retransmitting data according to the result of three-value determination.
  • the communication system can transmit ACK/NACK/DTX response from the mobile station to the base station in a format suitable for the MCS specified by the uplink-channel transmission information (UL Grant).
  • UL Grant uplink-channel transmission information
  • FIG. 2 is a block diagram of the configuration of the mobile station.
  • a mobile station 10 includes a receiver 11, a downlink-scheduling information receiving unit 12, a PDSCH receiving unit 13, and an uplink-channel transmission information receiving unit 14.
  • the mobile station 10 also includes an A/N-multiplex mode deciding unit 15, a modulation scheme DB 16, a PUSCH transmitting unit 17, a PUCCH transmitting unit 18, a selector 19, and a transmitter 20.
  • the receiver 11 is connected to each of the downlink-scheduling information receiving unit 12, the PDSCH receiving unit 13, and the uplink-channel transmission information receiving unit 14.
  • the receiver 11 receives various information and data transmitted from the base station and also receives various information. More specifically, the receiver 11 receives control channel (PDCCH) including downlink scheduling information (DL Scheduling Info.) from the base station, and receives the downlink data channel (PDSCH) including downlink transmission data from the base station.
  • the receiver 11 also receives uplink-channel transmission information (UL Grant) including MCS from the base station.
  • the downlink-scheduling information receiving unit 12 receives the control channel (PDCCH) including the downlink scheduling information (DL Scheduling Info.) from the base station through the receiver 11.
  • the downlink-scheduling information receiving unit 12 outputs the "DL scheduling info.” such as a bandwidth to be allocated (number of resource blocks (hereinafter, also called “number of RBs"); wireless resource) to the PDSCH receiving unit 13.
  • the control channel (PDCCH) can be received from the base station
  • the downlink-scheduling information receiving unit 12 instructs the PDSCH receiving unit 13 to receive the downlink data channel (PDSCH) (ON notification).
  • the downlink-scheduling information receiving unit 12 instructs the PDSCH receiving unit 13 about the effect (OFF notification). Furthermore, the downlink-scheduling information receiving unit 12 acquires MCS which is currently used from the received PDSCH and outputs the MCS to the PDSCH receiving unit 13.
  • the downlink-scheduling information receiving unit 12 receives the control channel (PDCCH) to receive the uplink-channel transmission information (UL Grant) including the MCS decided by the base station from the base station, and outputs the result of this to the uplink-channel transmission information receiving unit 14.
  • PDCCH control channel
  • UL Grant uplink-channel transmission information
  • the PDSCH receiving unit 13 When receiving the downlink data channel from the base station, the PDSCH receiving unit 13 decides a response content to the base station based on the result of decoding the downlink data channel. More specifically, the PDSCH receiving unit 13 receives the downlink data channel (PDSCH) from the base station according to the downlink scheduling information (DL Scheduling Information) received by the downlink-scheduling information receiving unit 12 through the receiver 11. The PDSCH receiving unit 13 also, when receiving "ON notification" from the downlink-scheduling information receiving unit 12, receives the PDSCH from the base station using the number of RBs and MCS included in the "DL Scheduling Information".
  • DL Scheduling Information downlink scheduling information
  • the PDSCH receiving unit 13 decodes the received PDSCH and performs CRC operation and the like.
  • the uplink-channel transmission information receiving unit 14 receives the uplink-channel transmission information (UL Grant) including the MCS decided by the base station from the base station through the receiver 11.
  • the uplink-channel transmission information receiving unit 14 acquires MCS from the "UL Grant” and outputs the MCS to the A/N-multiplex mode deciding unit 15. Furthermore, the uplink-channel transmission information receiving unit 14 outputs information (ON or OFF) as to whether PUSCH is transmitted, to the selector 19.
  • the A/N-multiplex mode deciding unit 15 decides a format for an uplink data channel to be transmitted to the base station based on the uplink-channel transmission information received from the base station. More specifically, when the MCS acquired by the uplink-channel transmission information receiving unit 14 is a small value less than a threshold, a required SNR is small, and thus, the A/N-multiplex mode deciding unit 15 increases the number of symbols for ACK/NACK to desirably increase ACK/NACK determination accuracy. Therefore, the A/N-multiplex mode deciding unit 15, when the MCS is small, decides to use the format #1 for overwriting the symbol for transmission of ACK/NACK in Data as represented in (a) of FIG. 3 .
  • the A/N-multiplex mode deciding unit 15 decides to use the format #2 for always ensuring the symbol for transmission of ACK/NACK as represented in (b) of FIG. 3 .
  • the A/N-multiplex mode deciding unit 15 outputs the decided format to the PUSCH transmitting unit 17.
  • the threshold of the MCS can be set according to, for example, a target error rate, or can be arbitrarily set from experimental data or the like.
  • FIG. 3 is a diagram of format examples of the uplink data channel.
  • the modulation scheme DB 16 is a database, as represented in FIG. 4 , that stores therein "MCS, MODULATION, TBS, CODE RATE" in association with one another.
  • the "MCS” stored herein is decided by the base station and indicates the value of MCS acquired by the uplink-channel transmission information receiving unit 14 in the mobile station 10.
  • the "Modulation” indicates a digital modulation scheme that modulates a carrier by giving discontinuous change thereto, including QPSK (Quadrature Phase Shift Keying), 16QAM (16 Quadrature Amplitude Modulation), and 64QAM (64 Quadrature Amplitude Modulation).
  • FIG. 4 is a diagram of examples of information stored in the modulation scheme DB.
  • the PUSCH transmitting unit 17 transmits the response content decided by the PDSCH receiving unit 13 to the base station through the uplink data channel using the format decided by the A/N-multiplex mode deciding unit 15. More specifically, the PUSCH transmitting unit 17, when ACK/NACK is responded using the format #1, overwrites ACK or NACK in a part of the Data portion of the data format as represented in (1)-(b) of FIG. 3 . Then, the PUSCH transmitting unit 17 transmits the uplink data channel (PUSCH) including the created uplink transmission data to the base station based on the uplink-channel transmission information (UL Grant). The PUSCH transmitting unit 17, when responding DTX using the format #1, has no data to be transmitted. Therefore, as represented in (1)-(a) of FIG. 3 , the PUSCH transmitting unit 17 transmits the uplink data channel (PUSCH) including the uplink transmission data in which nothing is overwritten in Data of the data format to the base station based on "UL Grant".
  • PUSCH uplink data channel
  • the PUSCH transmitting unit 17 when responds ACK/NACK using the format #2, writes ACK or NACK to a previously ensured predetermined area of the data format as represented in (2)-(b) of FIG. 3 . Then, the PUSCH transmitting unit 17 transmits the uplink data channel (PUSCH) including the created uplink transmission data to the base station based on the uplink-channel transmission information (UL Grant). Furthermore, the PUSCH transmitting unit 17, when responding DTX using the format #2, has no data to be transmitted for DTX. Therefore, as represented in (2)-(a) of FIG. 3 , the PUSCH transmitting unit 17 transmits the uplink data channel (PUSCH) including the uplink transmission data in which nothing is written to the previously ensured predetermined area in the data format to the base station based on the "UL Grant".
  • PUSCH uplink data channel
  • the transmitter 20 transmits the PUSCH or PUCCH selected by the selector 19 to the base station, or transmits other data to the base station.
  • FIG. 5 is a block diagram of the configuration of the base station.
  • a base station 50 includes a receiver 51, an uplink-SIR measuring unit 52, an A/N-multiplex mode deciding unit 53, a modulation scheme DB 54, a PUSCH-receiving and A/N-determining unit 55, a scheduler 56, a PDCCH transmitting unit 57, a PDSCH transmitting unit 58, and a transmitter 59.
  • the receiver 51 is connected to the uplink-SIR measuring unit 52 and the PUSCH-receiving and A/N-determining unit 55 or the like.
  • the receiver 51 receives various information and data transmitted from mobile stations. More specifically, the receiver 51 receives the uplink data channel (PUSCH) from the mobile station 10, and receives the uplink signal to measure the uplink SIR from the mobile station 10.
  • PUSCH uplink data channel
  • the uplink-SIR measuring unit 52 measures an SIR from the signal or the like received by the receiver 51. More specifically, the uplink-SIR measuring unit 52 measures a signal to interference power ratio (SIR) based on signal power received from the mobile station 10 and interference power received from the mobile station that communicates with other base station. Then, the uplink-SIR measuring unit 52 outputs the result of measurement (SIR value) to the A/N-multiplex mode deciding unit 53.
  • SIR signal to interference power ratio
  • the A/N-multiplex mode deciding unit 53 decides MCS used for the uplink data channel (PUSCH) based on the SIR measured by the uplink-SIR measuring unit 52. More specifically, the A/N-multiplex mode deciding unit 53 specifies the MCS corresponding to the SIR measured by the uplink-SIR measuring unit 52 from the modulation scheme DB 54, and outputs the MCS to the scheduler 56.
  • the modulation scheme DB 54 is a database in which "SIR" is further associated with "MCS, Modulation, TBS, CODE RATE" represented in FIG. 4 .
  • the PUSCH-receiving and A/N-determining unit 55 receives the uplink data channel (PUSCH) from the mobile station 10 through the receiver 51, and implements three-value determination of ACK/NACK/DTX using a method based on the MCS transmitted to the mobile station. More specifically, the PUSCH-receiving and A/N-determining unit 55, when having transmitted the MCS value less than the threshold (MCS is small) to the mobile station, uses the format #1 with a large number of symbols for ACK/NACK. Therefore, the PUSCH-receiving and A/N-determining unit 55 performs the three-value determination using the symbol pattern for ACK/NACK, and outputs the result to the scheduler 56.
  • MCS the threshold
  • a channel coding method of ACK/NACK is repetition coding in the PUSCH-receiving and A/N-determining unit 55
  • Q' represents the number of symbols of ACK or NACK
  • the PUSCH-receiving and A/N-determining unit 55 can calculate "S" used for the three-value determination by Expression (1).
  • the received PUSCH is ACK, then "-1" is added, and if it is NACK, then "+1" is added.
  • the PUSCH-receiving and A/N-determining unit 55 determines "S" calculated by Expression (1) using a determination expression represented by Expression (2), and can thereby determine that the received PUSCH is any one of responses: ACK/NACK/DTX.
  • the PUSCH-receiving and A/N-determining unit 55 when having transmitted the MCS value equal to or more than the threshold (MCS is large) to the mobile station, performs the three-value determination using the received power in an ACK/NACK area because the format #2 with a small number of symbols for ACK/NACK is used, and outputs the value to the scheduler 56.
  • the PUSCH-receiving and A/N-determining unit 55 calculates a value to perform two-value determination using first 2 bits in Table 1 using Expression (3).
  • Q m is 2 in QPSK, 4 in 16QAM, and 6 in 64QAM.
  • the right side of Expression (3) is a first bit + a second bit.
  • the PUSCH-receiving and A/N-determining unit 55 calculates ⁇ ABS using Expression (6), and can determine that the received PUSCH is any one of ACK/NACK/DTX by substituting ⁇ ABS and ⁇ A calculated by Expression (3) or ⁇ B calculated by Expression (4) into a determination expression of Expression (7).
  • the scheduler 56 transmits the control channel (PDCCH), the downlink data channel (PDSCH), and the MCS, and executes various processes related to HARQ. More specifically, the scheduler 56 transmits the PDCCH and PDSCH including the MCS decided by the A/N-multiplex mode deciding unit 53 to the mobile station 10. Furthermore, the scheduler 56, when the result of determination of the PUSCH-receiving and A/N-determining unit 55 is ACK, stops HARQ, and performs retransmission when the result of determination is NACK or DTX.
  • the PDCCH transmitting unit 57 transmits the control channel (PDCCH) including the downlink scheduling information (DL Scheduling Information) such as a bandwidth to be allocated, to the mobile station 10 according to an instruction operation by the scheduler 56.
  • the PDSCH transmitting unit 58 transmits the uplink-data channel transmission information (UL Grant) to the mobile station using the control channel (PDCCH) and transmits the downlink data channel (PDSCH) including downlink transmission data to the mobile station according to the instruction operation by the scheduler 56.
  • UL Grant uplink-data channel transmission information
  • PDSCH downlink data channel
  • FIG. 6 is a flowchart of a processing flow of the mobile station
  • FIG. 7 is a flowchart of a processing flow of the base station.
  • the mobile station 10 when having received PDCCH (UL Grant) from the base station 50 (Yes at Step S101), determines whether it has received PDCCH (DL Scheduling Information) from the base station 50 (Step S102).
  • PDCCH UL Grant
  • PDCCH DL Scheduling Information
  • the mobile station 10 when having received the PDCCH (DL Scheduling Information) from the base station 50 (Yes at Step S102), acquires PDSCH information from the received PDCCH (DL Scheduling Information) (Step S103). Then, the mobile station 10 receives PDSCH according to the acquired PDSCH information (Step S104). At this time, the mobile station 10 performs decoding and CRC operation on the received PDSCH, and creates ACK/NACK.
  • DL Scheduling Information DL Scheduling Information
  • the mobile station 10 decides a format for transmitting the PUSCH based on the MCS included in the uplink-channel transmission information received from the base station 50 according to the PDCCH (UL Grant) received at Step S101 (Step S105).
  • the mobile station 10 then transmits the PUSCH including an ACK/NACK response using the format decided at Step S105 to the base station 50 (Step S106).
  • the mobile station 10 when not having received the PDCCH (UL Grant) from the base station 50 (No at Step S101), determines whether it has received the PDCCH (DL Scheduling Information) from the base station 50 (Step S107).
  • the mobile station 10 when having received the PDCCH (DL Scheduling Information) from the base station 50 (Yes at Step S107), transmits PUCCH including the ACK/NACK response to the base station 50 (Step S108).
  • the mobile station 10 when not having received the PDCCH (DL Scheduling Information) from the base station 50 (No at Step S102), decides a format for transmitting PUSCH (Step S109). At this time, the mobile station 10 decides the format based on the MCS included in the uplink-channel transmission information received from the base station 50 according to the PDCCH (UL Grant) received at Step S101.
  • PDCCH DL Scheduling Information
  • the mobile station 10 transmits the PUSCH to the base station 50 using the format decided at Step S109 (Step S110).
  • the base station 50 measures an SIR from communication with the mobile station 10 (Yes at Step S201), and decides MCS and an A/N multiplex mode (three-value determination mode) based on the result of measurement (Step S202).
  • the base station 50 then transmits the control channel (PDCCH) including "DL Scheduling Information" to the mobile station 10, and transmits the downlink data channel (PDSCH) or the like including the downlink transmission data to the mobile station 10 using the PDCCH (Step S203). It should be noted that the base station 50 transmits the uplink-data channel transmission information (UL Grant) to the mobile station 10 using PDCCH different from the PDCCH.
  • PDCCH control channel
  • PDSCH downlink data channel
  • UL Grant uplink-data channel transmission information
  • the base station 50 when having received the PUSCH or PUCCH from the mobile station 10 (Yes at Step S204), performs three-value determination on the ACK/NACK symbol of the received PUSCH or PUCCH using the A/N multiplex mode (three-value determination mode) decided at Step S202 (Step S205).
  • the base station 50 stops HARQ (Step S207). Then, when it is determined that the ACK response is not included in the received PUSCH or PUCCH (No at Step S206), the base station 50 determines whether NACK is included therein (Step S208).
  • the base station 50 executes automatic retransmission of the PDSCH (Step S209).
  • the base station 50 executes retransmission of the PDCCH (Step S210).
  • the ACK/NACK/DTX response can be transmitted from the mobile station to the base station in a format suitable for MCS specified by the uplink-channel transmission information (UL Grant).
  • UL Grant uplink-channel transmission information
  • the first embodiment has explained the example of deciding the format of PDSCH based on the MCS.
  • the bandwidth to be allocated (number of RBs) is variable
  • the format can also be decided in consideration of the number of RBs.
  • the number of RBs is the threshold (N) or more
  • the number of symbols for ACK/NACK is set to K or more, and the format #1 for overwriting ACK/NACK in a part of PUSCH is used.
  • the format is switch by the MCS.
  • K is decided as the number of symbols with which the three-value determination of the ACK/NACK/DTX can be performed
  • N is decided as the number of RBs which causes the overhead of K to be regarded as being small.
  • FIG. 8 is a diagram of an example of how to select a format in consideration of the number of RBs.
  • the format allowing for the number of RBs can be selected, and thus, even if any value is used as the number of RBs being variable, it is possible to ensure high ACK/NACK determination accuracy without a decrease of transmission efficiency of data signals.
  • the second embodiment has explained the example of deciding the format allowing for the bandwidth to be allocated (number of RBs). Furthermore, the format can be decided according to whether MIMO (Multiple Input Multiple Output) communication is applied.
  • MIMO Multiple Input Multiple Output
  • the format #2 for always ensuring symbols for ACK/NACK transmission is used, and when MIMO is not applied, then, similarly to the first embodiment, the format is switched by MCS. That is, because the required SNR is large when the MIMO is applied, the MIMO is not applied for ACK/NACK response. Furthermore, whether the MIMO is applied or not is decided by the scheduler 56 in the base station 50, and it is notified to the mobile station 10 by using "UL Grant".
  • the format #2 for always ensuring symbols for ACK/NACK transmission is used irrespective of the number of RBs and MCS.
  • the MIMO is not applied, the number of RBs is "1 to 10", and the MCS is "0 to 10", then the format #1 for overwriting ACK/NACK in a part of PUSCH is used.
  • the MIMO is not applied, the number of RBs is "1 to 10", and the MCS is "11 to 28”, then the format #2 for always ensuring symbols for ACK/NACK transmission is used.
  • the MIMO is not applied and the number of RBs is "11 or more”, then the format #1 for overwriting ACK/NACK in a part of PUSCH is used irrespective of the MCS.
  • the mobile station 10 when the MIMO is applied to multiplex data and transmit the data at the time of not transmitting ACK/NACK (for example, when DTX is responded), transmits data in which nothing is written to MIMO multiplex 1 and MIMO multiplex 2, as represented in FIG. 10 , to the base station 50. Moreover, when the MIMO is applied to multiplex data and transmit the data at the time of transmitting ACK/NACK (for example, ACK or NACK is responded), as represented in FIG. 11 , the mobile station 10 transmits data in which an ACK/NACK response is written to the MIMO multiplex 1 but nothing is written to the MIMO multiplex 2, to the base station 50.
  • ACK/NACK for example, when DTX is responded
  • MIMO mentioned here represents a wireless communication technology for widening a band of data transmission/reception by combining a plurality of antennas. For example, different data are simultaneously transmitted through a plurality of antennas and are combined upon reception thereof.
  • the MIMO multiplex 1 and the MIMO multiplex 2 represented in FIG. 10 and FIG. 11 illustrate formats when different data are multiplexed in the same frequency band and are transmitted, and thus, the MIMO multiplex 1 and the MIMO multiplex 2 respectively contain different data.
  • FIG. 9 is a diagram of an example of how to select a format in consideration of whether MIMO is applied
  • FIG. 10 is a diagram of MIMO multiplexed examples when A/N is not transmitted
  • FIG. 11 is a diagram of MIMO multiplexed examples when A/N is transmitted.
  • the selection of format in consideration of application of the MIMO becomes possible, and even if a plurality of antennas are combined to widen the band for data transmission/reception, it is possible to ensure high ACK/NACK determination accuracy without a decrease in the efficiency.
  • the first to the third embodiments have exemplified QPSK, 16QAM, and 64QAM, or the like as the modulation schemes, however, any scheme can be adopted if it is a digital modulation scheme used for wireless communication such as OFDM (Orthogonal Frequency-Division Multiplexing).
  • OFDM Orthogonal Frequency-Division Multiplexing
  • the operating procedures, the control procedures, and the information including specific names, various data, and parameters can be arbitrarily changed unless otherwise specified.
  • the terminal device and the base station device disclosed in the present application it is possible to ensure high ACK/NACK determination accuracy without a decrease in efficiency.

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  • Engineering & Computer Science (AREA)
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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)

Claims (10)

  1. Dispositif terminal (10) comprenant :
    une unité de décision de format (15) qui décide un format de transmission d'un canal de données de liaison montante à transmettre à un dispositif de station de base (50) sur la base d'une information de transmission de canal de liaison montante pour spécifier un format de transmission d'un canal de données de liaison montante à transmettre à la station de base (50) reçu du dispositif de station de base (50) ;
    une unité de décision de réponse (13) qui décide un contenu de réponse au dispositif de station de base (50) lorsqu'un canal de données de liaison descendante est reçu du dispositif de station de base (50), sur la base d'un résultat de décodage du canal de données de liaison descendante ; et
    une unité de transmission de réponse (17) qui transmet le contenu de réponse décidé par l'unité de décision de réponse (13) au dispositif de station de base (50) par l'intermédiaire du canal de données de liaison montante en utilisant le format de transmission décidé par l'unité de décision de format (15), caractérisé en ce que
    l'unité de décision de format (15) commute entre un premier format pour superposer le contenu de réponse dans des données et un second format garantissant une zone pour le contenu de réponse indiquant si la réponse est transmise ou non au dispositif de station de base (50), sur la base de l'information de transmission de canal de liaison montante.
  2. Dispositif terminal (10) selon la revendication 1, dans lequel l'unité de décision de réponse (13), lorsqu'elle a reçu le canal de données de liaison descendante du dispositif de station de base (50), décide une réussite de la réception ou un échec de réception comme le contenu de réponse au dispositif de station de base (50) sur la base d'un résultat de décodage du canal de données de liaison descendante, et décide aucune réponse comme le contenu de réponse au dispositif de station de base (50) lorsque le canal de données de liaison descendante ne peut pas être reçu du dispositif de station de base (50).
  3. Dispositif terminal (10) selon la revendication 1 ou 2, dans lequel l'unité de décision de format (15), lorsqu'une valeur de schéma de modulation et de codage (MCS pour Modulation and Coding Scheme) indiquant une combinaison d'un schéma de modulation et d'un débit de code de canal inclus dans l'information de transmission de canal de liaison montante est inférieure à un seuil, décide d'utiliser le premier format, et décide d'utiliser le second format lorsque la valeur du MCS est égale ou supérieure au seuil.
  4. Dispositif terminal (10) selon la revendication 1 ou 2, dans lequel l'unité de décision de format (15), lorsqu'une ressource sans fil allouée à la transmission de données de liaison montante du dispositif terminal (10) au dispositif de station de base (50) est égale ou supérieure à un seuil, décide d'utiliser le premier format.
  5. Dispositif terminal (10) selon la revendication 1 ou 2, dans lequel l'unité de décision de format (15), lorsqu'un multiplex MIMO est appliqué à la transmission de données de liaison montante du dispositif terminal (10) au dispositif de station de base (50), décide d'utiliser le second format.
  6. Procédé de contrôle d'un dispositif terminal (10), comprenant :
    la première décision d'un format de transmission d'un canal de données de liaison montante à transmettre à un dispositif de station de base (50) sur la base d'une information de transmission de canal de liaison montante pour spécifier un format de transmission d'un canal de données de liaison montante à transmettre à la station de base (50) reçu du dispositif de station de base (50) ;
    la seconde décision d'un contenu de réponse au dispositif de station de base (50) lorsqu'un canal de données de liaison descendante est reçu du dispositif de station de base (50), sur la base d'un résultat de décodage du canal de données de liaison descendante ; et
    la transmission du contenu de réponse décidé au dispositif de station de base (50) par l'intermédiaire du canal de données de liaison montante en utilisant le format de transmission décidé, caractérisé en ce que
    la première décision inclut la commutation entre un premier format pour superposer le contenu de réponse dans des données et un second format pour garantir une zone pour le contenu de réponse indiquant si la réponse est transmise ou non au dispositif de station de base (50), sur la base de l'information de transmission de canal de liaison montante.
  7. Dispositif de station de base (50) comprenant :
    une unité de mesure (52) qui mesure un rapport signal sur interférence en utilisant des signaux de contrôle reçus d'un dispositif terminal (10) par l'intermédiaire d'une communication sans fil ;
    une unité de décision (53) qui décide une information de transmission de canal de liaison montante pour spécifier un format de transmission d'un canal de données de liaison montante à transmettre à la station de base (50) sur la base du rapport signal sur interférence mesuré par l'unité de mesure (52) ;
    une unité de transmission (56) qui transmet l'information de transmission de canal de liaison montante au dispositif terminal (10) en utilisant un canal de contrôle incluant une information d'ordonnancement de liaison descendante ;
    une unité de contrôle de réponse (55) qui transmet un canal de données de liaison descendante au dispositif terminal (10), et reçoit un canal de données de liaison montante incluant un contenu de réponse indiquant un résultat de la réception du canal de données de liaison descendante ; et
    une unité de spécification de réponse (55) qui spécifie un contenu de réponse à partir du canal de données de liaison montante reçu par l'unité de contrôle de réponse (55) dans un procédé de détermination selon l'information de transmission de canal de liaison montante décidée par l'unité de décision (53), caractérisé en ce que
    l'unité de contrôle de réponse (55) reçoit un premier canal de données de liaison montante transmis en utilisant un premier format pour superposer le contenu de réponse dans des données ou un second canal de données de liaison montante transmis en utilisant un second format pour garantir une zone pour le contenu de réponse indiquant si la réponse est transmise ou non au dispositif de station de base (50), le premier format et le second format sont commutés sur la base de l'information de transmission de canal de liaison montante ;
    l'unité de spécification de réponse (55) spécifie un contenu de réponse dans le procédé de détermination en utilisant chaque configuration binaire d'un signal de réponse dans le premier canal de données de liaison montante indiquant une réussite de la réception ou d'un signal de réponse dans le premier canal de données de liaison montante indiquant un échec de la réception, ou spécifie le contenu de réponse dans un procédé de détermination en utilisant la puissance reçue dans la zone garantie dans le second canal de données de liaison montante, selon l'information de transmission de canal de liaison montante.
  8. Dispositif de station de base (50) selon la revendication 7, dans lequel,
    l'unité de spécification de réponse (55), lorsqu'une valeur de schéma de modulation et de codage (MCS) indiquant une combinaison d'un schéma de modulation et d'un débit de codes de canal inclus dans l'information de transmission de canal de liaison montante est inférieure à un seuil, spécifie un contenu de réponse dans le procédé de détermination en utilisant chaque configuration binaire d'un signal de réponse indiquant une réussite de la réception ou d'un signal de réponse indiquant un échec de la réception, et lorsque la valeur MCS incluse dans l'information de transmission de canal de liaison montante est égale ou supérieure au seuil, spécifie le contenu de réponse dans un procédé de détermination en utilisant la puissance reçue dans la zone garantie.
  9. Dispositif de station de base (50) selon la revendication 7, dans lequel
    l'unité de contrôle de réponse (55) reçoit, lorsqu'une ressource sans fil allouée à la transmission de données de liaison montante du dispositif terminal (10) au dispositif de station de base (50) est égale ou supérieure à un seuil, le premier canal de données de liaison montante transmis en utilisant le premier format.
  10. Dispositif de station de base (50) selon la revendication 7, dans lequel
    l'unité de contrôle de réponse (55) reçoit, lorsqu'un multiplex MIMO est appliqué à la transmission de données de liaison montante du dispositif terminal (10) au dispositif de station de base (50), le second canal de données de liaison montante transmis en utilisant le second format.
EP10164880A 2009-06-05 2010-06-03 Dispositif de terminal et dispositif de station de base Not-in-force EP2259467B1 (fr)

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US8422425B2 (en) 2013-04-16
US20100309865A1 (en) 2010-12-09
EP2259467A2 (fr) 2010-12-08
JP2010283698A (ja) 2010-12-16
EP2259467A3 (fr) 2011-05-04

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